import 'package:flutter/material.dart';
import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_ble_plugin/flutter_ble_plugin.dart';
import 'package:flutter_ble_plugin/src/flutter_ble_callback.dart'
    show BleCallBack;

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> implements BleCallBack {
  String _platformVersion = 'Unknown';
  final _flutterBlePlugin = FlutterBlePlugin();
  final Map<String, dynamic> _devices = {};

  @override
  void initState() {
    super.initState();
    initPlatformState();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    // We also handle the message potentially returning null.
    try {
      platformVersion = await _flutterBlePlugin.getPlatformVersion() ??
          'Unknown platform version';
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });

    _flutterBlePlugin.setCallback(this);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            FlutterBlePlugin().startScan((deviceId, deviceName) {});
          },
          child: const Icon(Icons.bluetooth),
        ),
        body: SingleChildScrollView(
          primary: false,
          child: Column(
            children: List.generate(_devices.length, (index) {
              final String key = _devices.keys.elementAt(index);
              return ElevatedButton(
                onPressed: () {
                  FlutterBlePlugin().connect(key);
                },
                child: Text("${_devices[key]} - $key"),
              );
            }),
          ),
        ),
      ),
    );
  }

  @override
  void onConnectionStateChange(String mac, bool isConnected) {
    // TODO: implement onConnectionStateChange
    print("onConnectionStateChange:  $mac ---- ${isConnected.toString()}");
    _flutterBlePlugin.sendData(
        mac, Uint8List.fromList([0x31, 0x32, 0x33, 0x34, 0x35]));
  }

  @override
  void onReceiveData(String mac, Uint8List data) {
    // TODO: implement onReceiveData
  }

  @override
  void onScanResult(String mac, String name) {
    print("deviceId: $mac, deviceName: $name");
    _devices[mac] = name;
    setState(() {});
  }
}
